help my endless P0507 code. 2003 M45

[rbfastback45]

took my 03 m45 to mechanic to replace the leaking valve covers, next day i notice the higher idle speed and then get the ses for the p0507 code.

•in park it idles at 1,100 rpm
•in drive it isles at 800-1000rpm

so i pull up the fsm, some youtube videos and a walkthrough from start to finish on what to do for unplugged throttle body.

reset/ clear the ses code then check all of this is good and correct

Battery voltage: More than 12.9V (At idle)
- Engine coolant temperature: 70 - 99°C (158 - 210°F)
- PNP switch: ON
- Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set lighting switch to the 1st position to light
only small lamps.
- Steering wheel: Neutral (Straight-ahead position)most important
- Vehicle speed: Stopped
- Transmission: Warmed-up

"Throttle Valve Closed Position Learning" .
Turn ignition switch “OFF” and wait at least 10 seconds.

5. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.

6. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.

7. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL goes
off.

8. Fully release the accelerator pedal within 3 seconds after the MIL goes off.

9. Start engine and let it idle.

10. Wait 20 seconds.

11. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.

12. If idle speed and ignition timing are not within the specification, the result will be incomplete. In this case,find the cause of the problem by referring to the “Diagnostic Procedure” below.

at first it helped but was still high so i ordered a new a1 cardone throttle body from oreillys auto parts thinking the guy touched the butterfly or dropped/banged something

after this i did the whole relearn again and it idles at 800rpm in park and 600-650rpm in drive.

if that’s correct idle speeds it worked! or at least it’s better
it works until i turn the car off and back on.
then it just goes right back to as if i never did the relearn and 10-15 miles later the ses co es back on.
(i think that’s what it’s supposed to be unless it’s supposed to be idling at 650 in park vs drive??)

anyone that has advice pleas help.

unless it’s not the throttle body but it’s strange cuz after the relearn it seems to work fine, i was thinking maybe a pcv valve or vacuum line but couldn’t find any leaks. don’t even know if that would cause the problem or what else would.

whatever the shop did when replacing the valve covers did it, who know’s tho.

i’m hoping edboy would be able to help.
i’ve read every thread on idling problems but i just don’t know what to do now.

also cruise control won’t work anymore either but idk when that happened or if it’s even related.
if i hit the button it just beeps and both cruise control light stay solid (1 green and one yellow) no flashing like i’ve read can happen.

[Ilya]

Ed might have another recommendation but a quick Google seemed to point to the TB Actuator. It's weird that after you do the learn it seems normal and then go backs...

[Costee]

Without a tool with bi-directional capabilities, you've actually covered all necessary grounds. But I think the sore point here is the aftermarket throttle body. Somehow Nissan engines just don't work well with non-oem electronic parts. I'd rather a good used than a new aftermarket in this instance.

[rbfastback45]

thanks ilya, i thought it was also strange that it works perfectly till i turn it off and on again...
every day as a test i’ve been letting it warm up then doing the relearned procedure before i drive it any it will work perfectly the entire drive with no engine code. even after a 150 mile trip...

but turnit off and then on and it’s back to the high idle...GAY!!

and to costee:
it’s actually an oem infiniti throttle body NOT aftermarket.
it’s an oem remanufactured part by a company called a1 cardone that remanufactures parts for the 03-04 m45 since there arent much new parts left.
my thoughts are how did they remanufacture it? did they truly fix it the right way electronically?
why would it work but not after u turn the engine off then back on?
i’m returning it tomorrow and then i’m going too look into where to fine another that’s not remanufactured and just off a good running car.
maybe i’m retarded or just don’t know but what is a tool with bi-directional capabilities? also i’ve covered all necessary grounds?
maybe i need to read it again when i’m sober but don’t understand that lol

[rbfastback45]

costee if u mean a nice scan tool it was the scan tool from autozone that scanned it.

this what it here:


i’ve used 3 different scanners an they all say the same thing, sometime 3-4 of the same code

[Costee]

By the phrase covered all grounds, I meant you have by manual means satisfied all necessary parameters for a successful idle air volume learning. A tool with bi-directional capabilities is one that enables programming, such as the idle relearn. There's actually a TSB on this error code (P0507) for your car: ITB05:042. If you send me a PM I could find a way of forwarding it you if you can't access it. If the TSB is be followed the ECM in your car might need to reprogrammed by the dealer, more so you have a new (re-manufactured) TB unit. Perhaps this could be circumvented by using a good used unit as you have hinted.

[EdBwoy]

... replace the leaking valve covers, next day i notice the higher idle speed and then get the ses for the p0507 code.
...
unless it’s not the throttle body but it’s strange cuz after the relearn it seems to work fine, i was thinking maybe a pcv valve or vacuum line but couldn’t find any leaks. don’t even know if that would cause the problem or what else would.

whatever the shop did when replacing the valve covers did it, who know’s tho.

...

Actually, the PCV system and air leaks are possible causes for the P0507. I typically plan to replace the PCV valves and check the condition of the hoses whenever I have the valve covers off. It is very likely that the hoses leading to the PCV valves might have deteriorated and are leaking or maybe something was completely left off. You could also mess the routing of some lines over there (not likely for the PCV system, but seeing pictures of your car would help).

So, first thing I'd do is check the work done while the valve cover gaskets were replaced.

1. Check the intake tube itself, and make sure sure it doesn't have any open inlets or any tubes that lead to nowhere.
2. The PCV valves are on the front side of the Valve covers (I use a dipstick handle to highlight them in the pics)
On the back side there are other connections as well. The left bank has a Tee-d connection to the air intake, so check both hoses.
Maybe the PCV valves randomly died during the maintenance work. To chck their function, remove the tube at the valve with the engine idling and they should both be hissing (The valves themselves)






I think if both throttle bodies are doing the same thing, then it is unlikely that they are the problem.
Then, please confirm whether either of them have been tampered with by trying to adjust the slack on the throttle cable. The OEM setup should have had paint marks on the nuts to indicate the set position from factory for the throttle and cruise control cables... it might or might not change when you got a rebuilt unit.
We can explore this line later, after exhausting whatever work was done right before the code came up.

[EdBwoy]

Did this get resolved?

[EdBwoy]

It sure would be nice to see OP circle back and give an update

[rbfastback45]

hey i’m very sorry edbwoy and costee about not getting back to you guys..

i’ve had a lot of personal family stuff going on an no $.

unfortunately haven’t even drove the car much since my last post since it’s a side project that’s not had much attention lately....

i have not even had a chance to check the tsb info that costee sent me or all the good info that edbwoy posted either.

i promise i am going to get to this all very soon.
first when i install this catch can i will check the pcv valves then move on from there.

i’ve also had a few other electronic problems/glitches so i kinda got discouraged not being able to figure them out yet.

i will definitely get back to all this right after the holidays!!